I tried the command you mentioned, but its not valid for me. It only wants a <macaddr> after "table"... and not an ap-name argument...
(my_ctrl) #show datapath bridge table ?
<macaddr> xx:xx:xx:xx:xx:xx 48-bit MAC address to filter on
| Output Modifiers
(my_ctrl) #
Now, the following DOES give me a table...
(my_ctrl) #show datapath bridge ap-name my_ap
But nothing in this table really maps one of the displayed macs to ENET3 of the AP. I see many, many, macs listed in the first column. There is only one row that has the P flag, and this appears to be the APs ENET1 port (in my case the uplink port). This row entry also says "local" for the Destination column. I'm still not seeing an entry to ENET3.